Update dev

[moribvndvs]

Please check if the PR fulfills these requirements

• [x] The commit message follows our guidelines: https://github.com/HackedByChinese/ng2-idle/blob/master/CONTRIBUTING.md#pr
• [x] Tests for the changes have been added (for bug fixes / features)
• [x] Docs have been added / updated (for bug fixes / features)

What kind of change does this PR introduce? (check one with "x")

[ ] Bugfix
[ ] Feature
[ ] Code style update (formatting, local variables)
[ ] Refactoring (no functional changes, no api changes)
[ ] Build related changes
[ ] CI related changes
[x] Other... Please describe:

Recreates the project using ng-cli, updating a number of out-of-date and vulnerable devDependencies, adding much needed linting and formatting capabilities, and precommit lint+test and commit message linting.

Additionally, recreating with ng-cli brings the project up to date with Angular 8.

What is the current behavior? (You can also link to an open issue here)

• Vulnerabilities in the devDependencies
• Does not work with Angular 8

What is the new behavior?

• No vulnerabilities in devDependencies
• Works with Angular 8

Does this PR introduce a breaking change? (check one with "x")

[x] Yes
[ ] No

If this PR contains a breaking change, please describe the impact and migration path for existing applications: ...

• Your application must be using Angular 8.x
• Mock fixtures for testing (MockExpiry, MockInterruptSource, MockKeepaliveSvc) are currently not available externally. You'll need to create your own mock fixtures for the time being if you currently use these.
• Additionally, some unexpected issues may be experienced in the new build output since it is now using the ng-cli build tool rather than rollup.

Other information:

[coveralls]

Coverage increased (+0.6%) to 100.0% when pulling 45325d3b18e51fdae3d223a78ed177b65c15b919 on update-dev into 0d9980361f46e49b37a9477d6ffbd3df2454252c on master.

[moribvndvs]

That's correct. Interrupt is internal and not meant to be exported.

[moribvndvs]

I'm going to move ahead with merging this and releasing a 8.0.0-beta.1 build.

[bfwg]

LGTM 👍